Some AJAX services can trigger errors. Since r33686, there is a mechanism for services to report such errors. Unfortunately, this mechanism is based on PHP's sessions. Errors are displayed at the next regular Tiki page load, which may or may not be related with the request which causes the errors displayed.
This mechanism used to be implemented in lib/errorreportlib.php. Starting with Tiki 16, it was replaced by the Feedback library, but the approach hasn't changed and remains unreliable in Tiki trunk as of 2018-10-11. The Feedback library uses the tikifeedback element of $_SESSION.
This mechanism was first used by lib/search/searchlib-unified.php, but has since been spread widely, as can be seen in the commits which created the Feedback library (r58746, r58747 and r58748). One specific issue which can occur as of Tiki 18 is, after going to tiki-admin.php?page=search (which calls the lookup action of the search controller), to get a "Malformed search query" error at the next page load, which could be on tiki-admin_actionlog.php for example.
To help developers solve the bug, we kindly request that you demonstrate your bug on a show2.tiki.org instance. To start, simply select a version and click on "Create show2.tiki.org instance". Once the instance is ready (in a minute or two), as indicated in the status window below, you can then access that instance, login (the initial admin username/password is "admin") and configure the Tiki to demonstrate your bug. Priority will be given to bugs that have been demonstrated on show2.tiki.org.
Unable to connect to show.tikiwiki.org. Please let us know of the problem so that we can do something about it. Thanks.
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